The hammer is lifted by the revolution of the toothed cam, four times to each revolution. Force of blow depends upon weight and length of drop of hammer head. This is one of the first types of power-driven forging hammers.
[Virginia Downward & William M. Clark, 1930]

[Editorâs Note: This device is not a pure kinematic mechanism since the velocity of the hammer blow depends on the physics of gravity and not on the geometry alone. This device can be found in the mechanical movements catalog of Brown or 1868, Figure 353. FCM]